EP2020109A1 - Procédé et dispositif d'acquisition et de conservation de la commande du trafic associé à une station radio fixe dans un système de téléphonie cellulaire - Google Patents

Procédé et dispositif d'acquisition et de conservation de la commande du trafic associé à une station radio fixe dans un système de téléphonie cellulaire

Info

Publication number
EP2020109A1
EP2020109A1 EP06747798A EP06747798A EP2020109A1 EP 2020109 A1 EP2020109 A1 EP 2020109A1 EP 06747798 A EP06747798 A EP 06747798A EP 06747798 A EP06747798 A EP 06747798A EP 2020109 A1 EP2020109 A1 EP 2020109A1
Authority
EP
European Patent Office
Prior art keywords
rbs
temporary
list
traffic
targeted
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06747798A
Other languages
German (de)
English (en)
Other versions
EP2020109A4 (fr
Inventor
Mikael Lagerman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of EP2020109A1 publication Critical patent/EP2020109A1/fr
Publication of EP2020109A4 publication Critical patent/EP2020109A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W48/00—Access restriction; Network selection; Access point selection
    • H04W48/02—Access restriction performed under specific conditions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition

Definitions

  • a method and a device for gaining and maintaining control of the traffic from a radio base station in a cellular telephony system is disclosed.
  • the present invention relates to a method and a device for letting a temporary radio base station gain and maintain control of traffic to and from a targeted radio base station in a wireless cellular telecommunications system.
  • a temporary radio base station gain and maintain control of traffic to and from a targeted radio base station in a wireless cellular telecommunications system.
  • Document FR 2 858 742 describes a procedure and a device for tampering with cellular communications which addresses some of the problems described above.
  • the device appears to need a great deal of processor power, since it relies on a rather complex algorithm, and tries to identify certain signals on a more or less constant basis.
  • This need is met by the present invention in that it provides a method for letting a temporary radio base station gain and maintain control of the traffic to and from a targeted radio base station in a wireless cellular telecommunications system, where the system comprises a number of radio base station for routing traffic to and from user terminals in the system.
  • Each radio base station in such a system controls the traffic to and from a certain cell within the system, and at least a number of the radio base stations in the system each transmits an identity signal and a list of candidate frequencies for use by user terminals when switching to another radio base station.
  • switching to another base station refers to the fact that the user terminals in a cellular system will have their traffic controlled by and routed via a radio base station which fulfils certain criteria, among them signal strength.
  • signal strength from the current radio base station falls below a certain pre-defined level for a certain pre-defined amount of time, a transfer of the traffic is made to another radio base station from which a clearer signal is received by the user terminal.
  • control of the traffic to and from the targeted radio base station is gained by positioning the temporary radio base station in or adjacent to the cell of the targeted radio base station, and programming the temporary radio base station to transmit on one of the frequencies in the candidate list broadcast by the targeted radio base station.
  • the frequency on which the temporary RBS is programmed to transmit on is a frequency used by an RBS which is not immediately adjacent to the cell of the targeted RBS.
  • the temporary radio base station is made to transmit on a frequency which is monitored by the user terminals in the area in question, and with a power level which ensures transfer of the user terminal (-s) to the temporary radio base station from the targeted radio base station.
  • the temporary radio base station is made to transmit as its identity signal a signal which is the same as the identity signal of the radio base station on whose frequency the temporary radio base station transmits on. Hence, control of the traffic of the targeted radio base station will be acquired by the temporary radio base station.
  • the temporary radio base station In order to let the temporary radio base station not only gain but also maintain control of the traffic of the targeted radio base station, the temporary radio base station is programmed to transmit a list of candidate frequencies, but with the list being such that the user terminals cannot find signals with sufficient strength on any of the candidate frequencies in the vicinity of the take-over area. Accordingly, control of traffic which has been transferred to the temporary radio base station will also be maintained by it.
  • the list of candidate frequencies is made empty, which will mean that the candidate frequencies cannot be found by the radio base stations of which control has been gained, since the user terminals will in fact not look for candidate frequencies.
  • the method of the invention can be applied to a number of cellular telephony systems, among which can be mentioned TDMA systems such as the GSM system, or to CDMA systems.
  • the identity signal which will be used is the so called CGI-signal, or the BSIC signal (BSIC: Base Station Identity Code), and the list of candidate frequencies will be the so called BA list.
  • BSIC Base Station Identity Code
  • the temporary base station of the invention can achieve the desired objectives in a much more energy efficient manner, which makes it possible to design a smaller and more compact device than previously, which can conceivably be battery powered. Also, as opposed to traditional jammers, which have used the "brute force" approach, the device of the invention does not cause as much interfering noise in the system.
  • Fig 1 shows a part of a cellular system in which the invention may be applied
  • Fig 2 shows a flowchart outlining some major steps of a method according to the invention
  • Figs 3 and 4 show alternative steps for the flowchart of fig 2, and Fig 5 shows a system in which the invention is applied.
  • Fig 1 shows the general layout of a wireless cellular system 100, or at least a part of such a system.
  • the system comprises a plurality of separate and neighbouring geographical areas, so called “cells”, exemplified by the cell denoted as 110.
  • each cell there is usually one radio base station ("RBS") 120 which controls all traffic to and from user terminals 130 in the cell, and via which all traffic to and from the user terminals 130 in the cell 120 is routed.
  • RBS radio base station
  • the user terminals in the system continuously monitor the quality of the received signal from the RBS which routes and controls their traffic, in order to determine when their traffic should instead be controlled by and routed via another RBS, in other words if a so called "hand-over" to another RBS should be performed.
  • the signal quality as well as certain other predefined parameters are used when deciding if a hand-over should be made.
  • the decision of making a hand-over can be made either by the user terminal 130 or by a so called Base Station Controller (BSC) at system level.
  • BSC Base Station Controller
  • the decision is made by a control function or control means in the user terminal if the user terminal is not engaged in an active session, i.e. when the terminal is in the so called “idle mode", and by the BSC if the user terminal is in the so called “active mode", i.e. there is a voice or data session in progress.
  • the user terminal reports the relevant data to the BSC, which will then decide if and when a hand-over should be made.
  • Each cell in the system 100 has a globally unique identity within the system, in some systems such as GSM referred to as the CGI, the Cell Global Identity, which usually consists of 15 to 18 bytes. Since the CGI comprises such a rather large number of bits, a shorter identity is often used by the radio base station in the cell, the shorter identity being referred to as the BSIC, Base Station Identity Code.
  • GSM Global System for Mobile communications
  • BSIC Base Station Identity Code
  • the BSIC or the CGI are broadcast at frequent intervals by the radio base station 120 in the cell 110, so that the cell and its radio base station may be identified by the user terminals 130.
  • the BSIC and/or the CGI are broadcast by the radio base stations on a special channel, usually a special logical channel.
  • the so called BA list is a list of frequencies used by radio base stations in the neighbourhood of the broadcasting radio base station. With reference to fig 1 and the cell 110, the BA list is thus used by the user terminals 130 in the cell 110 in order to know which other frequencies should be monitored for signal quality and possibly used in hand-over.
  • a hand-over will roughly take place as follows: a user terminal 130 in the cell 110 will listen to the broadcast message from the radio base station in the cell 110, and will monitor the frequencies in the BA list to see if they provide a better signal quality than the radio base station in the cell 110. If the answer is affirmative, and certain other criteria are fulfilled, such as for example the duration of the signal quality, the user terminal 130 switches its traffic to the radio base station with the better quality, and then starts to monitor the BA list of that radio base station.
  • a method according to the invention utilizes an extra RBS, from now on referred to as a temporary RBS, in order to gain control of the traffic of the targeted RBS.
  • the BA list of the targeted radio base station.
  • This information can be obtained in a variety of ways, for example from the operator or operators of the cellular systems in that area, or by measurements carried out in the area in which it is desired to gain and maintain control of the traffic.
  • the temporary RBS is positioned in the cell of the targeted RBS, or adjacent to said cell, see block 210 of fig 2.
  • the temporary RBS is made to transmit on one of the frequencies in the candidate list of the targeted RBS, said frequency being used by an RBS which is suitably not immediately adjacent to the cell of the targeted RBS, see block 220 of fig 2.
  • the transmissions on said control frequency are made with such an output power level that user terminals within a certain area will perceive the signal from the temporary RBS as a signal of better quality than the targeted RBS, and will accordingly want to switch their traffic to the temporary RBS, see block 230 of fig 2.
  • the temporary RBS transmits on its control channel an identity which is the same as that of the RBS whose control frequency is used, see block 240 of fig 2.
  • user terminals within a certain area will perceive a signal which is stronger than that of the targeted RBS, and since the received signal is one of those on the candidate list of the targeted RBS, they will perceive it as a regular "competing" signal, and will switch their traffic to the temporary RBS.
  • the BSC When and if the BSC is notified of the measured signal strength by the user terminals, it will order them to switch their traffic to the temporary RBS for the same reason, i.e. that the temporary RBS will be perceived as an ordinary candidate for "hand-over".
  • the identity signal which is transmitted can be the so called CGI (Cell Global Identity) or the BSIC signals. This is outlined in fig 3.
  • the temporary RBS is, according to the invention, programmed to transmit a list of candidate frequencies, with the list being such that user terminals whose traffic has been transferred to the temporary RBS cannot find signals on any of the candidate frequencies in the vicinity of the cell of the targeted RBS, at least not with such a signal strength that they will appear as "attractive" candidates for a hand-over. Thus, there will be no “competing" frequencies to listen to, or at least to switch over to.
  • the candidate list can comprise frequencies of RBS's which are known to be so distant that they cannot compete with the temporary RBS.
  • This step of the invention can also be applied equally well to TDMA systems or CDMA systems. If applied to a GSM system, the candidate list will usually be the so called BA list.
  • control of traffic to and from a targeted RBS has been gained by the temporary RBS and will be maintained by it, which was the object of the invention.
  • the frequency which the temporary RBS 140 is made to transmit on is chosen from the candidate list of the targeted RBS 120.
  • the frequency should not be chosen from one of those used by neighbouring cells or base stations, for examples the base station of the cell denoted as 157-159 in fig 5, since those base stations might provide the user terminals of the targeted RBS 120 with a strong signal.
  • the temporary RBS 140 should be programmed to transmit on a frequency which is in the candidate list of the targeted RBS 120, but which belongs to an RBS which is as remote as possible from the targeted RBS 120 while still being in the candidate list of the targeted RBS 120.
  • the word "remote” in this context can be taken to mean either geographically or as an indicator of the strength of the signal from that RBS in the cell 110.
  • One example of a suitable such radio base stations is the one denoted by 151 in fig 5.
  • the temporary base station might have to "borrow" frequency and identity from a neighbouring RBS 157-159.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Time-Division Multiplex Systems (AREA)

Abstract

Procédé permettant à une station radio fixe (RBS, 140) temporaire d'acquérir et de conserver la commande du trafic associé à une RBS (120) cible dans un système (100), dans lequel les RBS émettent un signal d'identité et une liste de fréquences candidates destinées à être utilisées par les terminaux utilisateurs lors d'une commutation entre RBS. La RBS temporaire (140) est localisée dans la RBS cible (120) ou à proximité immédiate de celle-ci, et émet sur une fréquence figurant dans la liste de fréquences candidates de la RBS cible (120). Les émissions sont effectuée à un niveau de puissance occasionnant le transfert du trafic de la RBS cible (120) vers la RBS temporaire (140). La RBS émet le signal d'identité correspondant à celui des RBS dont la fréquence de transmission correspond à celle de la RBS temporaire, et émet une liste de fréquences candidates choisies de telle manière que les terminaux utilisateurs dont le trafic a été transféré vers la RBS temporaire ne sont en mesure détecter les signaux avec une puissance suffisante sur aucune des fréquences candidates.
EP06747798A 2006-05-22 2006-05-22 Procédé et dispositif d'acquisition et de conservation de la commande du trafic associé à une station radio fixe dans un système de téléphonie cellulaire Withdrawn EP2020109A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2006/000594 WO2007136309A1 (fr) 2006-05-22 2006-05-22 Procédé et dispositif d'acquisition et de conservation de la commande du trafic associé à une station radio fixe dans un système de téléphonie cellulaire

Publications (2)

Publication Number Publication Date
EP2020109A1 true EP2020109A1 (fr) 2009-02-04
EP2020109A4 EP2020109A4 (fr) 2011-12-28

Family

ID=38723549

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06747798A Withdrawn EP2020109A4 (fr) 2006-05-22 2006-05-22 Procédé et dispositif d'acquisition et de conservation de la commande du trafic associé à une station radio fixe dans un système de téléphonie cellulaire
EP06835973.6A Not-in-force EP2030355B1 (fr) 2006-05-22 2006-12-22 Procédé et dispositif utilisés dans une station mobile pour maintenir une liaison de télécommunication avec une station radio fixe dans un système de téléphonie cellulaire

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP06835973.6A Not-in-force EP2030355B1 (fr) 2006-05-22 2006-12-22 Procédé et dispositif utilisés dans une station mobile pour maintenir une liaison de télécommunication avec une station radio fixe dans un système de téléphonie cellulaire

Country Status (6)

Country Link
US (2) US9167503B2 (fr)
EP (2) EP2020109A4 (fr)
JP (1) JP4981899B2 (fr)
CN (2) CN101449604B (fr)
IL (1) IL194905A0 (fr)
WO (2) WO2007136309A1 (fr)

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CN101959263B (zh) * 2009-07-15 2015-07-22 中兴通讯股份有限公司 无线链路失败信息的发送方法与装置
FI20115297A0 (fi) 2011-03-29 2011-03-29 Nethawk Oyj Tilaajapäätelaitteen ohjaukseen ottaminen
CN105101212B (zh) * 2014-05-23 2019-11-29 南京中兴软件有限责任公司 一种定位伪基站的方法及装置
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Also Published As

Publication number Publication date
EP2030355A1 (fr) 2009-03-04
CN101461269B (zh) 2013-03-27
JP4981899B2 (ja) 2012-07-25
WO2007136309A1 (fr) 2007-11-29
CN101461269A (zh) 2009-06-17
EP2020109A4 (fr) 2011-12-28
JP2009538557A (ja) 2009-11-05
IL194905A0 (en) 2009-08-03
US20110164603A1 (en) 2011-07-07
EP2030355A4 (fr) 2010-09-01
WO2007136311A1 (fr) 2007-11-29
CN101449604A (zh) 2009-06-03
EP2030355B1 (fr) 2015-04-01
US20090186618A1 (en) 2009-07-23
CN101449604B (zh) 2011-09-07
US8478192B2 (en) 2013-07-02
WO2007136311A9 (fr) 2009-02-19
US9167503B2 (en) 2015-10-20

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